Resist composition

ABSTRACT

Although use of a nitrogen-containing compound as a basic compound component of a resist composition makes it possible to ease the T-top problem at an acid dissociation constant pKa falling within a range of 2 to 6, it is accompanied with the problem that the reaction, that is, acid diffusion upon use of a highly-reactive acid-labile group cannot be controlled. In order to overcome this problem, one or more basic compounds selected from those represented by the following formulas (I) to (III) and (1) to (4) are employed.

RELATED APPLICATIONS

This application is a divisional of U.S. application Ser. No. 09/697,921, filed on Oct. 27, 2000, allowed now U.S. Pat No. 6,673,511, which claims priority from Japanese Patent Application No. 308496/1999, filed on Oct. 29, 1999, the disclosures of which are incorporated by reference herein in their entireties.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a novel, chemically amplified resist composition suited for use in micro-lithography.

2. Description of the Related Art

The miniaturization of a pattern rule has been demanded in order to cope with a recent tendency of LSI technology to higher integration and higher speed. Under such a circumstance, far ultraviolet lithography has been regarded promising as the next-generation of micro-lithography. Even a pattern of 0.3 μm or less can be formed by far ultraviolet lithography, and use of a resist material exhibiting low light absorption makes it possible to form a pattern with side-wall angles nearly vertical to a substrate. In recent years, a technique making use of a high intensity KrF excimer laser as a far-UV light source has drawn attentions. There is accordingly a demand for the development of a low light absorbing and highly sensitive resist material which permits the use of the above-described technique for mass production.

From such a viewpoint, the recently-developed, chemically amplified positive type resist materials as described in Japanese Patent Publication (JP-B) No. 2-27660/'90 and Japanese Patent Provisional Publication (JP-A) No. 63-27829/'88 using an acid catalyst are particularly promising resist materials suited for far-UV lithography, because of their excellent characteristics such as high sensitivity, resolution and dry etching resistance.

Prior-art chemically amplified resists are however accompanied with the problems such as PED (Post Exposure Delay) that line patterns have a T-top profile, in other words, patterns become thick at the top, when the dwelling time from exposure to PEB (post exposure bake) is extended; and a so-called “trailing phenomenon” that patterns in the vicinity of a basic substrate, particularly, a substrate made of silicon nitride or titanium nitride are widened.

It is presumed that the T-top profile results from lowering in the solubility of the surface of a resist film, while the trailing phenomenon on a substrate results from lowering in solubility in the vicinity of the substrate.

In addition, during the time from exposure to PEB, a dark reaction for eliminating an acid-labile group proceeds, leading to a problem that the leaving size of the line of a positive resist decreases.

These problems are serious hindrance to practical use of the chemically amplified resist. Such problems of the conventional chemically amplified positive resist material not only make difficult dimensional control upon lithography but also impair dimensional control upon processing of a substrate by using dry etching [refer to: W. Hinsberg, et al., J. Photopolym. Sci. Technol., 6(4), 535-546(1993) and T. Kumada, et al., J. Photopolym. Sci. Technol., 6(4), 571-574(1993)].

It is understood that in these chemically amplified positive type resist materials, a basic compound in the air or on the surface of a substrate largely takes part in the problem of PED or trailing phenomenon on the substrate. An acid on the surface of a resist film generated by exposure to light reacts with a basic compound in the air and is thereby deactivated. The longer the dwelling time from exposure to PEB becomes, the more the amount of a deactivated acid increases, making it difficult to cause decomposition of an acid-labile group. An insolubilized layer is therefore formed on the surface and a pattern inevitably has a T-top configuration.

It is well known that addition of a basic compound is effective for overcoming PED, because it can suppress the influence of a basic compound in the air (as described in Japanese Patent Provisional Publication Nos. 5-232706/'93, 5-249683/'93, 5-158239/'93, 5-249662/'93, 5-257282/'93, 5-289322/193, 5-289340/'93, 6-194834/'93, 6-242605/'94, 6-242606/'94, 6-263716/'94, 6-263717/'94, 6-266100/'94, 6-266111/'94, 7-128859/'95, 7-92678/'95, 7-92680/'95, 7-92681/'95, 7-120929/'95 and 7-134419/'95).

As the basic compound, a nitrogen-containing-compound is well known and examples include amine compounds and amide compounds having a boiling point of 150° C. or greater. Specific examples include pyridine, polyvinyl pyridine, aniline, N-methylaniline, N,N-dimethylaniline, o-toluidine, m-toluidine, p-toluidine, 2,4-lutidine, quinoline, isoguinoline, formamide, N-methylformamide, N,N-dimethylformamide, acetamide, N-methylacetamide, N,N-dimethylacetamide, 2-pyrrolidone, N-methylpyrrolidone, imidazole, α-picoline, β-picoline, γ-picoline, o-aminobenzoic acid, m-aminobenzoic acid, p-aminobenzoic acid, 1,2-phenylenediamine, 1,3-phenylenediamine, 1,4-phenylenediamine, 2-quinolinecarboxylic acid, 2-amino-4-nitrophenol, and triazine compounds such as 2-(p-chlorophenyl)-4,6-trichloromethyl-s-triazine. Among them, pyrrolidone, N-methylpyrrolidone, o-aminobenzoic acid, m-aminobenzoic acid, p-aminobenzoic acid and 1,2-phenylenediamine are typical examples.

SUMMARY OF THE INVENTTON

Although the above-described nitrogen-containing compounds can ease the T-top problem at an acid dissociation constant pKa ranging from 2 to 6, they cannot control reaction, that is, acid diffusion upon use of a highly-reactive acid-labile group.

When a weak base is added, a dark reaction in PED proceeds at an unexposed portion, thereby causing a reduction in a line size (slimming) and a decrease in film thickness on the line surface. Addition of a strong base having a pKa of 7 or greater is effective for overcoming the above-described problem.

However, higher pKa does not always bring about good results. Even when a superstrong base such as DBU (1,8-diazabicyclo[5,4,0]-7-undecene) or DBN (1,5-diazabicyclo[4,3,0]-5-nonen), proton sponge, or a quaternary amine such as tetramethylammonium hydroxide is added, a sufficient effect is not available.

The present inventors have carried out various investigations. As a result, it has been found that amines represented by formulas (I) to (III) and (1) to (4) having a carbonyl group, an ester group, or a carbonate group are highly effective for preventing a decrease in the thickness of a resist film and also for enlarging a focus margin and bringing about dimensional stability. N(X)_(n)(Y)_(3-n)  (I) wherein, n stands for 1, 2 or 3, preferably 1 or 2, side chains Xs may be the same or different and each independently represents —R¹—O—R² or —R¹—C(═O)—O—R⁶¹ (in which R¹s are the same or different and each independently represents an alkylene group of 1 to 5 carbon atoms, R²s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms containing a carbonyl or ester group, and R⁶¹s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a carbonyl group, an ester group, an ether group, a hydroxyl group or a lactone ring, or R¹ and R²‘or R² and R⁶¹ in the same side chain may be coupled together to form a ring); and side chains Ys are the same or different and each independently represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain an ether or hydroxyl group.

In the above-described formulas, R¹s are the same or different and each independently represents an alkylene group of 1 to 5 carbon atoms, R²s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms containing a carbonyl or ester group, R³ represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms, and R⁴s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a carbonyl, ester or ether group.

wherein, R⁶² represents a linear or branched alkylene group of 1 to 5 carbon atoms, p stands for 0, 1 or 2 with the proviso that p+q=3, R⁶³s are the same or different and each independently represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 15 carbon atoms which may contain an ether, carbonyl, ester or hydroxyl group, and R⁶⁴s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a carbonyl group, an ester group, an ether group, a hydroxyl group or a lactone ring.

wherein, R⁶⁵s are the same or different and each independently represents a linear, branched or cyclic alkyl groups of 1 to 15 carbon atoms which may contain an ether, carbonyl, ester or hydroxyl group.

In another aspect of the present invention, there is also provided a positive type resist composition, which can comprise (A): one or more basic compounds selected from the group consisting of formulas (I) to (III) and formulas (1) to (4), (B): an organic solvent, and (C1): a base resin which is an alkali insoluble or sparingly soluble resin having an acidic functional group protected with an acid-labile group but becomes alkali soluble when the acid-labile group is eliminated, and (D): an acid generator; and optionally (E): a dissolution inhibitor.

In a further aspect of the present invention, there is also provided a negative type resist composition, which comprises (A): one or more basic compounds selected from the group consisting of formulas (I) to (III) and (1) to (4), (B): an organic solvent, and (C2): a base resin which is alkali soluble but becomes alkali sparingly soluble by crosslinking with a crosslinker, (D): an acid generator, and (F): a crosslinker which undergoes crosslinking by an acid.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention relates to a resist composition containing one or more basic compounds selected from those represented by formulas (I) to (III) and (1) to (4).

Specific examples of the basic compounds represented by formulas (I) to (III) and (1) to (4) include, but not limited to, tris(2-formyloxyethyl)amine, tris(2-acetoxyethyl)amine, tris(2-propionyloxyethyl)amine, tris(2-butyryloxyethyl)amine, tris(2-isobutyryloxyethyl)amine, tris(2-valeryloxyethyl)amine, tris(2-pivaloyloxyethyl)amine, N,N-bis(2-acetoxyethyl)-2-(acetoxyacetoxy)ethylamine, tris(2-methoxycarbonyloxyethyl)amine, tris(2-tert-butoxycarbonyloxyethyl)amine, tris[2-(2-oxopropoxy)ethyl]amine, tris[2-(methoxycarbonylmethyl)oxyethyl]amine, tris[2-(tert-butoxycarbonylmethyloxy)ethyl]amine; and tris[2-(cyclohexyloxycarbonylmethyloxy)ethyl]amine {corresponding to the formulas (1) and (III)}; tris(2-methoxycarbonylethyl)amine and tris(2-ethoxycarbonylethyl)amine {corresponding to the formula (I), (II) and (3)}; N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-hydroxyethyl)-2-(ethoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(ethoxycarbonyl)ethylamine, N,N-bis(2-hydroxyethyl)-2-(2-methoxyethoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(2-methoxyethoxycarbonyl)ethylamine, N,N-bis(2-hydroxyethyl)-2-(2-hydroxyethoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(2-acetoxyethoxycarbonyl)ethylamine, N,N-bis(2-hydroxyethyl)-2-[(methoxycarbonyl)methoxycarbonyl]ethylamine, N,N-bis(2-acetoxyethyl)-2-[(methoxycarbonyl)methoxycarbonyl]ethylamine, N,N-bis(2-hydroxyethyl)-2-(2-oxopropoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(2-oxopropoxycarbonyl)ethylamine, N,N-bis(2-hydroxyethyl)-2-(tetrahydrofurfuryloxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(tetrahydrofurfuryloxycarbonyl)ethylamine, N,N-bis(2-hydroxyethyl)-2-[(2-oxotetrahydrofuran-3-yl)oxycarbonyl]ethylamine, N,N-bis(2-acetoxyethyl)-2-[(2-oxotetrahydrofuran-3-yl)oxycarbonyl]ethylamine, N,N-bis(2-hydroxyethyl)-2-(4-hydroxybutoxycarbonyl)ethylamine, N,N-bis(2-formyloxyethyl)-2-(4-formyloxybutoxycarbonyl)ethylamine, N,N-bis(2-formyloxyethyl)-2-(2-formyloxyethoxycarbonyl)ethylamine, N,N-bis(2-methoxyethyl)-2-(methoxycarbonyl)ethylamine, N-(2-hydroxyethyl)bis[2-(methoxycarbonyl)ethyl]amine, N-(2-acetoxyethyl)bis[2-(methoxycarbonyl)ethyl]amine, N-(2-hydroxyethyl)bis[2-(ethoxycarbonyl)ethyl]amine, N-(2-acetoxyethyl)bis[2-(ethoxycarbonyl)ethyl]amine, N-(3-hydroxy-1-propyl)bis[2-(methoxycarbonyl)ethyl]amine, N-(3-acetoxy-1-propyl)bis[2-(methoxycarbonyl)ethyl]amine, and N-(2-methoxyethyl)bis[2-(methoxycarbonyl)ethyl]amine {corresponding to the formula (I) and (II)}; N-butylbis[2-(methoxycarbonyl)ethyl]amine and N-butylbis[2-(2-methoxyethoxycarbonyl)ethyl]amine {corresponding to the formula (1) and (4)}; N-methylbis(2-acetoxyethyl)amine, N-ethylbis(2-acetoxyethyl)amine, N-methylbis(2-pivaloyloxyethyl)amine, N-ethylbis[2-(methoxycarbonyloxy)ethyl]amine, N-ethylbis[2-(tert-butoxycarbonyloxy)ethyl]amine {corresponding to the formula (I) and (2)}; tris(methoxycarbonylmethyl)amine and tris(ethoxycarbonylmethyl)amine {corresponding to the formula (I) and (3)}; N-butylbis(methoxycarbonylmethyl)amine and N-hexylbis(methoxycarbonylmethyl)amine {corresponding to the formula (I) and (4)}; and β-(diethylamino)-δ-valerolactone {corresponding to the formula (I)}.

As the organic solvent usable as Component (B) in the present invention, any organic solvent permitting dissolution therein of an acid generator, base resin, dissolution inhibitor or the like may be used. Examples of such an organic solvent include ketones such as cyclohexanone and methyl-2-n-amylketone, alcohols such as 3-methoxybutanol, 3-methyl-3-methoxybutanol, 1-methoxy-2-propanol and 1-ethoxy-2-propanol, ethers such as propylene glycol monomethyl ether, ethylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol monoethyl ether, propylene glycol dimethyl ether and diethylene glycol dimethyl ether and esters such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethyl lactate, ethyl pyruvate, butyl acetate, methyl 3-methoxypropionate, ethyl 3-ethoxypropionate, tert-butyl acetate, tert-butyl propionate and propylene glycol mono-tert-butyl ether acetate. They may be used either singly or in admixture of two or more, but an organic solvent usable in the present invention is not limited to them.

In the present invention, diethylene glycol dimethyl ether, 1-ethoxy-2-propanol or ethyl lactate in which the acid generator contained in the resist composition is most soluble., or propylene glycol monomethyl ether acetate which is a safe solvent, or a solvent mixture therewith is preferably employed among the above-described organic solvents.

Regarding a base polymer (C) of the present invention, a base resin (C1) which has an acidic functional group protected with an acid-labile group and is insoluble or sparingly soluble in alkali, but becomes soluble in an alkali by the elimination of the acid-labile group is usable for a positive type resist composition, while a base resin (C2) which is soluble in alkali but becomes sparingly soluble in alkali by crosslinking with a crosslinker is usable for a negative type resist composition. The “insoluble or sparingly soluble in alkali” means that solubility in an aqueous solution of 2.38% by weight of TMAH (tetramethylammonium hydroxide) is 0 or less than 20 Å/sec, and “soluble in alkali” means that solubility in an aqueous solution of 2.38% by weight of TMAH is 20 to 300 Å/sec.

Examples of the base polymer used as the component (C) in the present invention for a KrF excimer laser resist of 248 nm in wavelength, EUV resist of 3 to 20 nm in wavelength, EB resist or X-ray resist include polyhydroxystyrene (PHS) and copolymers thereof with styrene, (meth)acrylate or maleimide-N-carboxylate; those of the base polymer for an ArF excimer laser of 193 nm in wavelength include (meth)acrylate polymers, alternating copolymers of norbornene and maleic anhydride, polynorbornene polymers and metathesis ring-opening polymerization type polymers; and those for an F₂ excimer laser of 157 nm wavelength include the above-exemplified polymers substituted with fluorine. The base polymer (C) is however not limited thereto. In the above, “(meth)acrylate” means methacrylate or acrylate.

The base polymer (C1) usable for the positive type resist composition is obtained by substituting the hydrogen atom of the hydroxyl group of the phenol or carboxyl group of the base polymer (C2) with an acid-labile group. It is the common practice to lower the dissolution rate of an unexposed portion by such substitution.

As the acid-labile group, groups represented by the below-described formula (5) or (6), tertiary alkyl groups of 4 to 40 carbon atoms reprented by the below-described formula (7), trialkylsilyl groups of 1 to 6 carbon atoms and oxoalkyl groups of 4 to 20 carbon atoms are preferred among various groups.

wherein, R⁶ and R⁹ each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a hetero atom such as oxygen, sulfur, nitrogen or fluorine, R⁷ and R⁸ each independently represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a hetero atom such as oxygen, sulfur, nitrogen or fluorine, and a stands for an integer of 0 to 10, or R⁷ and R⁸, R⁷ and R⁹, and R⁸ and R⁹ may each be coupled together to form a ring.

Additional examples of R⁶, R⁹ or R¹² include non-substituted or substituted aryl groups such as phenyl group and alkoxy-substituted phenyl groups, e.g., p-methylphenyl, p-ethylphenyl and p-methoxyphenyl and aralkyl groups such as benzyl and phenethyl.

Specific examples of the acid-labile group represented by the formula (5) include tert-butoxycarbonyl, tert-butoxycarbonylmethyl, tert-amyloxycarbonyl, tert-amyloxycarbonylmethyl, 1-ethoxyethoxycarbonylmethyl, 2-tetrahydropyranyloxycarbonylmethyl and 2-tetrahydrofuranyloxycarbonylmethyl groups.

Specific examples of the acid-labile group represented by the formula (6) include linear or branched acetal groups such as 1-methoxyethyl, 1-ethoxyethyl, 1-n-propoxyethyl, 1-isopropoxyethyl, 1-n-butoxyethyl, 1-isobutoxyethyl, 1-sec-butoxyethyl, 1-tert-butoxyethyl, 1-tert-amyloxyethyl, 1-ethoxy-n-propyl, 1-cyclohexyloxyethyl, methoxypropyl, ethoxypropyl, 1-methoxy-1-methylethyl and 1-ethoxy-1-methylethyl; and cyclic acetal groups such as tetrahydrofuranyl and tetrahydropyranyl groups. Preferred are ethoxyethyl, butoxyethyl and ethoxypropyl groups.

At least 0.1% of the hydrogen atoms of the hydroxyl groups of the base polymer may undergo intramolecular or intermolecular crosslinking via an acid-labile group (crosslinking group) represented by the following formula (8a) or (8b).

In the above formulas, R¹⁹ and R²⁰ each represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 8 carbon atoms. R¹⁹ and R²⁰ may be coupled together to form a ring and if so, R¹⁹ and R²⁰ each represents a linear or branched C₁₋₈ alkylene group.

R²¹ represents a linear, branched or cyclic alkylene group of 1 to 10 carbon atoms and b stands for 0 or an integer of 1 to 10.

A represents an aliphatic or alicyclic, saturated hydrocarbon group, aromatic hydrocarbon group or heterocyclic group having a valence of a and 1 to 50 carbon atoms. The above-described group may have a hetero atom interposed therein, or a part of the hydrogen atoms bonded to the carbon atoms of the group may be substituted with a hydroxyl group, a carboxyl group, a carbonyl group or a fluorine atom. B represents —CO—O—, —NHCO—O— or NHCONH—. a stands for an integer of 2 to 8, and a′ represents an integer of 1 to 7. They satisfy the following equation of a=(a′+1).

R¹⁰, R¹¹ and R¹² in the formula (7) each represents a monovalent hydrocarbon group such as linear, branched or cyclic C₁₋₂₀ alkyl group and it may contain a hetero atom such as oxygen, sulfur, nitrogen or fluorine. R¹⁰ and R¹³, R¹⁰ and R¹², or R¹¹ and R¹² may be coupled together to form a ring. Alternatively, these groups may contain an oxygen atom, their hydrogen atom bonded to the carbon atom may be substituted with a hydroxyl group, or their two hydrogen atoms may be substituted with an oxygen atom to form a carbonyl-group.

Examples of the tertiary alkyl group represented by the formula (7) include tert-butyl, triethylcarbinyl, 2-ethyl-2-norbornyl, 1-methylcyclohexyl, 1-ethylcyclopentyl, 2-(2-methyl)adamantyl, 2-(2-ethyl)adamantyl and tert-amyl groups.

Examples of the trialkylsilyl group of 1 to 6 carbon atoms used as the acid-labile group include trimethylsilyl, triethylsilyl and dimethyl-tert-butylsilyl groups.

Examples of the oxoalkyl group of 4 to 20 carbon atoms used as the acid-labile group include a 3-oxocyclohexyl group and groups represented by the following formulas:

The base polymer as Component (C) preferably has a weight average molecular weight ranging from 5,000 to 100,000. The molecular weights less than 5,000 may make the film forming property and resolution property inferior, while the molecular weights exceeding 100,000, on the other hand, may make resolution property inferior.

Examples of the acid generator as Component (D) include onium salts of the below-described formula (9), diazomethane derivatives of the formula (10), glyoxime derivatives of the formula (11), β-ketosulfone derivatives, disulfone derivatives, nitrobenzyl sulfonate derivatives, sulfonate derivatives and imido-ylsulfonate derivatives.

 (R³⁰)_(b)M⁺K⁻  (9)

In the above-described formulas, R³⁰s may be the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 12 carbon atoms, aryl group of 6 to 12 carbon atoms or aralkyl group of 7 to 12 carbon atoms, M⁺ represents iodonium or sulfonium, K⁻ represents a non-nucleophilic counterion and b stands for 2 or 3.

R³¹ and R³² each represents a linear, branched or cyclic alkyl group of 1 to 12 carbon atoms or halogenated alkyl group, aryl or halogenated aryl group of 6 to 12 carbon atoms, or aralkyl group of 7 to 12 carbon atoms.

R³³, R³⁴ and R³⁵ each represents a linear, branched or cyclic alkyl group or halogenated alkyl group of 1 to 12 carbon atoms, aryl or halogenated aryl group of 6 to 12 carbon atoms, or an aralkyl group of 7 to 12 carbon atoms. R³⁴ and R³⁵ may be coupled together to form a cyclic structure and if so, R³⁴ and R³⁵ each represents a linear or branched alkylene group of 1 to 6 carbon atoms.

Examples of the alkyl group of 1 to 12 carbon atoms represented by R³⁰ in the formula (9) include methyl, ethyl, propyl, butyl, cyclohexyl, 2-oxocyclohexyl, norbornyl and adamantyl groups. Examples of the aryl group of 6 to 12 carbon atoms include phenyl, alkoxyphenyl groups such as p-methoxyphenyl, m-methoxyphenyl, o-methoxyphenyl, ethoxyphenyl, p-tert-butoxyphenyl and m-tert-butoxyphenyl and alkylphenyl groups such as 2-methylphenyl, 3-methylphenyl, 4-methylphenyl, ethylphenyl, 4-tert-butylphenyl, 4-butylphenyl and dimethylphenyl groups. Examples of the aralkyl groups of 7 to 12 carbon atoms include benzyl and phenetyl. Examples of the non-nucleophilic counterion as K⁻ include halide ions such as chloride ion and bromide ion, fluoroalkyl sulfonates such as triflate, 2,2,2-trifluoroethane sulfonate and nonafluorobutane sulfonate, aryl sulfonates such as tosylate, benzene sulfonate, 4-fluorobenzene sulfonate and 2,3,4,5,6-pentafluorobenzene sulfonate and alkyl sulfonates such as mesylate and butane sulfonate.

Examples of the alkyl group of 1 to 12 carbon atoms as R³¹ or R³² in the formula (10) include methyl, ethyl, propyl, butyl, amyl, cyclopentyl, cyclohexyl, norbornyl and adamantyl groups; those of the halogenated alkyl group of 1 to 12 carbon atoms include trifluoromethyl, 2,2,2-trifluoroethyl, 2,2,2-trichloroethyl and nonafluorobutyl groups; those of the C₆₋₁₂ aryl group include a phenyl group and alkoxyphenyl groups such as p-methoxyphenyl, m-methoxyphenyl, o-methoxyphenyl, ethoxyphenyl, p-tert-butoxyphenyl and m-tert-butoxyphenyl groups and alkylphenyl groups such as 2-methylphenyl, 3-methylphenyl, 4-methylphenyl, ethylphenyl, 4-tert-butylphenyl, 4-butylphenyl and dimethylphenyl groups; those of the halogenated aryl groups of 6 to 12 carbon atoms include fluorobenzene, chlorobenzene and 2,3,4,5,6-pentafluorobenzene groups; and those of the aralkyl group of 7 to 12 carbon atoms include benzyl and phenetyl.

Examples of the alkyl group of 1 to 12 carbon atoms, halogenated alkyl group of 1 to 12 carbon atoms, aryl group of 6 to 12 carbon atoms, halogenated aryl group of 6 to 12 carbon atoms and aralkyl group of 7 to 12 carbon atoms represented by R³³, R³⁴ or R³⁵ in the formula (11), include those described in R³¹ and R³². Examples of the alkylene group of 1 to 6 carbon atoms for R³⁴ or R³⁵ include methylene, ethylene, propylene, butylene and hexylene groups.

Specific examples of the onium salt in the formula (9) include diphenyliodonium trifluoromethanesulfonate, (p-tert-butoxyphenyl)phenyliodonium trifluoromethanesulfonate, diphenyliodonium p-toluenesulfonate, (p-tert-butoxyphenyl)phenyliodonium p-toluenesulfonate, triphenylsulfonium trifluoromethanesulfonate, (p-tert-butoxyphenyl)diphenylsulfonium trifluoromethanesulfonate, bis(p-tert-butoxyphenyl)phenylsulfonium trifluoromethanesulfonate, tris(p-tert-butoxyphenyl)sulfonium trifluoromethanesulfonate, triphenylsulfonium p-toluenesulfonate, (p-tert-butoxyphenyl)diphenylsulfonium p-toluenesulfonate, bis(p-tert-butoxyphenyl)phenylsulfonium p-toluenesulfonate, tris(p-tert-butoxyphenyl)sulfonium p-toluenesulfonate, triphenylsulfonium nonafluorobutanesulfonate, triphenylsulfonium butanesulfonate, trimethylsulfonium trifluoromethanesulfonate, trimethylsulfonium p-toluenesulfonate, cyclohexylmethyl(2-oxocyclohexyl)sulfonium trifluoromethanesulfonate, cyclohexylmethyl(2-oxocyclohexyl)sulfonium p-toluenesulfonate, dimethylphenylsulfonium trifluoromethanesulfonate, dimethylphenylsulfonium p-toluenesulfonate, dicyclohexylphenylsulfonium trifluoromethanesulfonate and dicyclohexylphenylsulfonium p-toluenesulfonate.

Examples of the diazomethane derivative in the formula (10) include bis(benzenesulfonyl)diazomethane, bis(p-toluenesulfonyl)diazomethane, bis(xylenesulfonyl)diazomethane, bis(cyclohexylsulfonyl)diazomethane, bis(cyclopentylsulfonyl)diazomethane, bis(n-butylsulfonyl)diazomethane, bis(isobutylsulfonyl)diazomethane, bis(sec-butylsulfonyl)diazomethane, bis(n-propylsulfonyl)diazomethane, bis(isopropylsulfonyl)diazomethane, bis(tert-butylsulfonyl)diazomethane, bis(n-amylsulfonyl)diazomethane, bis(isoamylsulfonyl)diazomethane, bis(sec-amylsulfonyl)diazomethane, bis(tert-amylsulfonyl)diazomethane, 1-cyclohexylsulfonyl-1-(tert-butylsulfonyl)diazomethane, 1-cyclohexylsulfonyl-1-(tert-amylsulfonyl)diazomethane and 1-tert-amylsulfonyl-1-(tert-butylsulfonyl)diazomethane.

Examples of the glyoxime derivative in the formula (11) include bis-o-(p-toluenesulfonyl)-α-dimethylglyoxime, bis-o-(p-toluenesulfonyl)-α-diphenylglyoxime, bis-o-(p-toluenesulfonyl)-α-dicyclohexylglyoxime, bis-o-(p-toluenesulfonyl)-2,3-pentanedioneglyoxime, bis-o-(p-toluenesulfonyl)-2-methyl-3,4-pentanedioneglyoxime, bis-o-(n-butanesulfonyl)-α-dimethylglyoxime, bis-o-(n-butanesulfonyl)-α-diphenylglyoxime, bis-o-(n-butanesulfonyl)-α-dicyclohexylglyoxime, bis-o-(n-butanesulfonyl)-2,3-pentanedioneglyoxime, bis-o-(n-butanesulfonyl)-2-methyl-3,4-pentanedioneglyoxime, bis-o-(methanesulfonyl)-α-dimethylglyoxime, bis-o-(trifluoromethanesulfonyl)-α-dimethylglyoxime, bis-o-(1,1,1-trifluoroethanesulfonyl)-α-dimethylglyoxime, bis-o-(tert-butanesulfonyl)-α-dimethylglyxoxime, bis-o-(perfluorooctanesulfonyl)-α-dimethylglyoxime, bis-o-(cyclohexanesulfonyl)-α-dimethylglyoxime, bis-o-(benzenesulfonyl)-α-dimethylglyoxime, bis-o-(p-fluorobenzenesulfonyl)-α-dimethylglyoxime, bis-o-(p-tert-butylbenzenesulfonyl)-α-dimethylglyoxime, bis-o-(xylenesulfonyl)-α-dimethylglyoxime and bis-o-(camphorsulfonyl)-α-dimethylglyoxime.

Examples of the β-ketosulfone derivative include 2-cyclohexylcarbonyl-2-(p-toluenesulfonyl)propane and 2-isopropylcarbonyl-2-(p-toluenesulfonyl)propane.

Further examples of the acid generator (D) include disulfone derivatives such as diphenyldisulfone and dicyclohexyldisulfone, nitrobenzyl sulfonate derivatives such as 2,6-dinitrobenzyl p-toluenesulfonate and 2,4-dinitrobenzyl p-toluenesulfonate, sulfonate derivatives such as 1,2,3-tris(methanesulfonyloxy)benzene, 1,2,3-tris(trifluoromethanesulfonyloxy)benzene and 1,2,3-tris(p-toluenesulfonyloxy)benzene, imido-ylsulfonate derivatives such as phthalimido-yl-triflate, phthalimido-yl-tosylate, 5-norbronene-2,3-dicarboxyimido-yl-triflate, 5-norbornene-2,3-dicarboxyimido-yl-tosylate and 5-norbornene-2,3-dicarboxyimido-yl-n-butylsulfonate.

Preferred examples include onium salts such as triphenylsulfonium trifluoromethanesulfonate, (p-tert-butoxyphenyl)diphenylsulfonium trifluoromethanesulfonate, tris(p-tert-butoxyphenyl)sulfonium trifluoromethanesulfonate, triphenylsulfonium p-toluenesulfonate, (p-tert-butoxyphenyl)diphenylsulfonium p-toluenesulfonate, and tris(p-tert-butoxyphenyl)sulfonium p-toluenesulfonate; diazomethane derivatives such as bis(benzenesulfonyl)diazomethane, bis(p-toluenesulfonyl)diazomethane, bis(cyclohexylsulfonyl)diazomethane, bis(n-butylsulfonyl)diazomethane, bis(isobutylsulfonyl)diazomethane, bis(sec-butylsulfonyl)diazomethane, bis(n-propylsulfonyl)diazomethane, bis(isopropylsulfonyl)diazomethane, and bis(tert-butylsulfonyl)diazomethane; glyoxime derivatives such as bis-o-(p-toluenesulfonyl)-α-dimethylglyoxime and bis-o-(n-butanesulfonyl)-α-dimethylglyoxime; and naphthoquinonediazidesulfonate derivatives.

The above-exemplified acid generators may be used either singly or in combination.

The onium salts are excellent in rectangularity improving effects, while the diazomethane derivatives and glyoxime derivatives are excellent in standing-wave reducing effects. Use of these two types of acid generators in combination makes it possible to conduct fine profile control.

The acid generator is preferably added in an amount of 0.2 to 50 parts by weight, particularly, 0.5 to 40 parts by weight based on 100 parts by weight of the base resin in total. When the amount is less than 0.2 part by weight, an acid generation amount upon exposure is small, which may lead to inferior sensitivity and resolution. Amounts exceeding 50 parts by weight, on the other hand, lower the transmittance of the resulting resist, which may lead to inferior resolution.

Examples of the dissolution inhibitor serving as the component (E) include compounds having a molecular weight of 3000 or less whose solubility in an alkali developing solution changes by acid action, particularly, compounds obtained by partially or wholly substituting a phenol or carboxylic acid derivative having a molecular weight as low as 2,500 or less with an acid-labile substituent.

Examples of the phenol or carboxylic acid derivative having a molecular weight of 2500 or less include bisphenol A, bisphenol H, bisphenol S, 4,4-bis(4′-hydroxyphenyl)valeric acid, tris(4-hydroxyphenyl)methane, 1,1,1-tris(4′-hydroxyphenyl)ethane, 1,1,2-tris(4′-hydroxyphenyl)ethane, phenolphthalein, and thymolphthalein, while those of the acid-labile substituent include those exemplified above as the acid-labile group of the base polymer.

Preferred examples of the dissolution inhibitor include bis(4-(2′-tetrahydropyranyloxy)phenyl)methane, bis(4-(2′-tetrahydrofuranyloxy)phenyl)methane, bis(4-tert-butoxyphenyl)methane, bis(4-tert-butoxycarbonyloxyphenyl)methane, bis(4-tert-butoxycarbonylmethyloxyphenyl)methane, bis(4-(1′-ethoxyethoxy)phenyl)methane, bis(4-(1′-ethoxypropyloxy)phenyl)methane, 2,2-bis(4′-(2″-tetrahydropyranyloxy))propane, 2,2-bis(4′-(2″-tetrahydrofuranyloxy)phenyl)propane, 2,2-bis(4′-tert-butoxyphenyl)propane, 2,2-bis(4′-tert-butoxycarbonyloxyphenyl)propane, 2,2-bis(4-tert-butoxycarbonylmethyloxyphenyl)propane, 2,2-bis(4′-(1″-ethoxyethoxy)phenyl)propane, 2,2-bis(4′-(1″-ethoxypropyloxy)phenyl)propane, tert-butyl 4,4-bis(4′-(2′-tetrahydropyranyloxy)phenyl)valerate, tert-butyl 4,4-bis(4′-(2″-tetrahydrofuranyloxy)phenyl)valerate, tert-butyl 4,4-bis(4′-tert-butoxyphenyl)valerate, tert-butyl 4,4-bis(4-tert-butoxycarbonyloxy)phenyl)valerate, tert-butyl 4,4-bis(4′-tert-butoxycarbonylmethyloxy)phenyl)valerate, tert-butyl 4,4-bis(4′-(1″-ethoxyethoxy)phenyl)valerate, tert-butyl 4,4-bis(4′-(1″-ethoxypropyloxy)phenyl)valerate, tris(4-(2′-tetrahydropyranyloxy)phenyl)methane, tris(4-(2′-tetrahydrofuranyloxy)phenyl)methane, tris(4-tert-butoxyphenyl)methane, tris(4-tert-butoxycarbonyloxyphenyl)methane, tris(4-tert-butoxycarbonyloxymethylphenyl)methane, tris(4-(1′-ethoxyethoxy)phenyl)methane, tris(4-(1′-ethoxypropyloxy)phenyl)methane, 1,1,2-tris(41′-(2″-tetrahydropyranyloxy)phenyl)ethane, 1,1,2-tris(4′-(2″-tetrahydrofuranyloxy)phenyl)ethane, 1,1,2-tris(4′-tert-butoxyphenyl)ethane, 1,1,2-tris(4′-tert-butoxycarbonyloxyphenyl)ethane, 1,1,2-tris(4′-tert-butoxycarbonylmethyloxyphenyl)ethane, 1,1,2-tris(4′-(1′-ethoxyethoxy)phenyl)ethane, and 1,1,2-tris(4′-(1′-ethoxypropyloxy)phenyl)ethane.

In the present invention, the dissolution inhibitor is added preferably in an amount of 20 parts by weight or less, more preferably 15 parts by weight or less relative to 100 parts by weight of the solid content in the resist material. Amounts greater than 20 parts by weight increase the monomer component, may thereby deteriorating the heat resistance of the resist material.

Examples of the crosslinker as Component (F) include compounds having, in the molecule thereof, at least two hydroxymethyl groups, alkoxymethyl groups, epoxy groups or vinyl ether groups. Among them, substituted glycoluril derivatives, urea derivatives and hexa(methoxymethyl)melamine are used preferably.

Specific examples include N,N,N′,N′-tetramethoxymethylurea, hexamethylmelamine, tetrahydroxymethyl-substituted glycolurils, tetraalkoxymethyl-substituted glycolurils such as tetramethoxymethyl glycoluril, bis-hydroxymethylphenols, and condensation products between phenol compounds and epichlorohydrin or the like such as bisphenol A.

Particularly preferred examples of the crosslinker include 1,3,5,7-tetraalkoxymethylglycolurils such as 1,3,5,7-tetramethoxymethylglycoluril, 1,3,5,7-tetrahydroxymethylglycoluril, 2,6-dihydroxymethyl p-cresol, 2,6-dihydroxymethylphenol, 2,2′,6,6′-tetrahydroxymethyl bisphenol A, 1,4-bis-[2-(2-hydroxypropyl)]-benzene, N,N,N′,N′-tetramethoxymethylurea and hexamethoxymethylmelamine.

A crosslinker which undergoes crosslinking by an acid is preferred.

The amount of the crosslinker is not limited, but it is added in an amount of 1 to 25 parts by weight, preferably 5 to 20 parts by weight based on the whole solid content of the resist composition. The above-described crosslinkers may be used either singly or in combination.

As a base, conventionally employed bases other than the above-described ones may be used either singly or in combination. Examples of the conventionally employed bases include aliphatic primary, secondary or tertiary amines, mixed amines, aromatic amines, heterocyclic amines, nitrogen-containing compounds having a carboxyl group, nitrogen-containing compounds having a sulfonyl group, nitrogen-containing compounds having a hydroxy group, nitrogen-containing compounds having a hydroxyphenyl group, alcoholic nitrogen-containing compounds, amide derivatives and imide derivatives.

Examples of the aliphatic primary amine include ammonia, methylamine, ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, sec-butylamine, tert-butylamine, pentylamine, tert-amylamine, cyclopentylamine, hexylamine, cyclohexylamine, heptylamine, octylamine, nonylamine, decylamine, dodecylamine, cetylamine, methylenediamine, ethylenediamine, and tetraethylenepentamine, those of the aliphatic secondary amine include dimethylamine, diethylamine, di-n-propylamine, diisopropylamine, di-n-butylamine, diisobutylamine, di-sec-butylamine, dipentylamine, dicyclopentylamine, dihexylamine, dicyclohexylamine, diheptylamine, dioctylamine, dinonylamine, didecylamine, didodecylamine, dicetylamine, N,N-dimethylmethylenediamine, N,N-dimethylethylenediamine and N,N-dimethyltetraethylenepentamine; and those of the aliphatic tertiary amine include trimethylamine, triethylamine, tri-n-propylamine, triisopropylamine, tri-n-butylamine, triisobutylamine, tri-sec-butylamine, tripentylamine, tricyclopentylamine, trihexylamine, tricyclohexylamine, triheptylamine, trioctylamine, trinonylamine, tridecylamine, tridodecylamine, tricetylamine, N,N,N′,N′-tetramethylmethylenediamine, N,N,N′,N′-tetramethylenediamine and N,N,N′,N′-tetramethyltetraethylenepentamine.

Examples of the mixed amine include dimethylethylamine, methylethylpropylamine, benzylamine, phenethylamine and benzyldimethylamine. Specific examples of the aromatic amine or heterocyclic amine include aniline derivatives (ex. aniline, N-methylaniline, N-ethylaniline, N-propylaniline, N,N-dimethylaniline, 2-methylaniline, 3-methylaniline, 4-methylaniline, ethylaniline, propylaniline, trimethylaniline, 2-nitroaniline, 3-nitroaniline, 4-nitroaniline, 2,4-dinitroaniline, 2,6-dinitroaniline, 3,5-dinitroaniline, N,N-dimethyltoluidine, etc.), diphenyl(p-tolyl)amine, methyldiphenylamine, triphenylamine, phenylenediamine, naphthylamine, diaminonaphthalene, pyrrole derivatives (ex. pyrrole, 2H-pyrrole, 1-methylpyrrole, 2,4-dimethylpyrrole, 2,5-dimethylpyrrole, N-methylpyrrole, etc.), oxazole derivatives (ex. oxazole, isoxazole, etc.), thiazole derivatives (ex. thiazole, isothiazole, etc.), imidazole derivatives (ex. imidazole, 4-methylimidazole, 4-methyl-2-phenylimidazole, etc.), pyrazole derivatives, furazane derivatives, pyrroline derivatives (ex. pyrroline, 2-methyl-1-pyrroline, etc.), pyrrolidine derivatives (ex. pyrrolidine, N-methylpyrrolidine, pyrrolidinone, N-methylpyrrolidone, etc.), imidazoline derivatives, imidazolidine derivatives, pyridine derivatives (ex. pyridine, methylpyridine, ethylpyridine, propylpyridine, butylpyridine, 4-(1-butylpentyl)pyridine, dimethylpyridine, trimethylpyridine, triethylpyridine, phenylpyridine, 3-methyl-2-phenylpyridine, 4-tert-butylpyridine, diphenylpyridine, benzylpyridine, methoxypyridine, butoxypyridine, dimethoxypyridine, 1-methyl-2-pyridone, 4-pyrrolidinopyridine, 1-methyl-4-phenylpyridine, 2-(1-ethylpropyl)pyridine, amonopyridine, dimethylaminopyridine, etc.), pyridazine derivatives, pyrimidine derivatives, pyrazine derivatives, pyrazoline derivatives, pyrazolidine derivatives, piperidine derivatives, piperazine derivatives, morpholine derivatives, indole derivatives, isoindole derivatives, 1H-indazole derivatives, indoline derivatives, quinoline derivatives (ex. quinoline, 3-quinolinecarbonitrile, etc.), isoquinoline derivatives, cinnoline derivatives, quinazoline derivatives, quinoxaline derivatives, phthalazine derivatives, purine derivatives, pteridine derivatives, carbazole derivatives, phenanthridine derivatives, acridine derivatives, phenazine derivatives, 1,10-phenanthroline derivatives, adenine derivatives, adenosine derivatives, guanine derivatives, guanosine derivatives, uracil derivatives and uridine derivatives.

Examples of the nitrogen-containing<compound having a carboxyl group include aminobenzoic acid, indolecarboxylic acid, amino acid derivatives (ex. nicotinic acid, alanine, arginine, asparatic acid, glutamic acid, glycine, histidine, isoleucine, glycylleucine, leucine, methionine, phenylalanine, threonine, lysine, 3-aminopyrazine-2-carboxylic acid, methoxyalanine, etc.); those of the nitrogen containing compound having a sulfonyl group include 3-pyridinesulfonic acid and pyridinium p-toluenesulfonate; and those of the nitrogen-containing compound having a hydroxy group, nitrogen-containing compound having a hydroxyphenyl group or alcoholic nitrogen-containing compound include 2-hydroxypyridine, aminocresol, 2,4-quinolinediol, 3-indolemethanol hydrate, monoethanolamine, diethanolamine, triethanolamine, N-ethyldiethanolamine, N,N-diethylethanolamine, triisopropanolamine, 2,2′-iminodiethanol, 2-aminoethanol, 3-amino-1-propanol, 4-amino-1-butanol, 4-(2-hydroxyethyl)morpholine, 2-(2-hydroxyethyl)pyridine, 1-(2-hydroxyethyl)piperazine, 1-[2-(2-hydroxyethoxy)ethyl]piperazine, piperidineethanol, 1-(2-hydroxyethyl)pyrrolidine, 1-(2-hydroxyethyl)-2-pyrrolidinone, 3-piperidino-1,2-propanediol, 3-pyrrolidino-1,2-propanediol, 8-hydroxyjulolidine, 3-quinuclidinol, 3-tropanol, 1-methyl-2-pyrrolidineethanol, 1-aziridineethanol, N-(2-hydroxyethyl)phthalimide and N-(2-hydroxyethyl)isonicotinamide. Examples of the amide derivative include formamide, N-methylformamide, N,N-dimethylformamide, acetamide, N-methylacetamide, N,N-dimethylacetamide, propionamide, and benzamide, while those of the imide derivatives include phthalimide, succinimide and maleimide.

Furthermore, the basic compound represented by the below-described formula (B)-1 or (B)-2 can be incorporated.

wherein, R⁴¹, R⁴², R⁴³, R⁴⁷ and R⁴⁸ each independently represents a linear, branched or cyclic C₁₋₂₀ alkylene group, R⁴⁴, R⁴⁵, R⁴⁶, R⁴⁹ and R⁵⁰ each independently represents a hydrogen atom, a C₁₋₂₀ alkyl group or an amino group, or R⁴⁴ and R⁴⁵, R⁴⁵ and R⁴⁶, R⁴⁴ and R⁴⁶, R⁴⁵ with R⁴⁴ and R⁴⁶, and R⁴⁹ and R⁵⁰ may each be coupled together to form a ring, and S, T and U each independently stands for an integer of 0 to 20 with the proviso that when S, T, U=0, each of R⁴⁴, R⁴⁵, R⁴⁶, R⁴⁹ and R⁵⁰ does not contain a hydrogen atom.

The alkylene group for R⁴¹, R⁴², R⁴³, R⁴⁷ or R⁴⁸ contains 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms, more preferably 1 to 8 carbon atoms. Specific examples include methylene, ethylene, n-propylene, isopropylene, n-butylene, isobutylene, n-pentylene, isopentylene, hexylene, nonylene, decylene, cyclopentylene and cyclqhexylene groups.

The alkyl group for R⁴⁴, R⁴⁵, R⁴⁶, R⁴⁹ or R⁵⁰, contains 1 to 20 carbon atoms, preferably 1 to 8 carbon atoms, more preferably 1 to 6 carbon atoms. Specific examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, hexyl, nonyl, decyl, dodecyl, tridecyl, cyclopentyl and cyclohexyl groups.

When R⁴⁴ and R⁴⁵, R⁴⁵ and R⁴⁶, R⁴⁴ and R⁴⁶, R⁴⁴ and R⁴⁵ and R⁴⁶, or R⁴⁹ and R⁵⁰ form a ring, the ring has 1 to 20, preferably 1 to 8, more preferably 1 to 6 carbon atoms. In this ring, a C₁₋₆, particularly C₁₋₄ alkyl group may be branched.

S, T and U each stands for an integer of 0 to 20, preferably 1 to 10, more preferably 1 to 8.

Specific examples of the Compound (B)-1 or (B)-2 include tris{2-(methoxymethoxy)ethyl}amine, tris{2-(methoxyethoxy)ethyl}amine, tris[2-{(2-methoxyethoxy)methoxy}ethyl]amine, tris{2-(2-methoxyethoxy)ethyl}amine, tris{2-(1-methoxyethoxy)ethyl}amine, tris{2-(1-ethoxyethoxy)ethyl}amine, tris{2-(1-ethoxypropoxy)ethyl}amine, tris[2-{(2-hydroxyethoxy)ethoxy}ethyl]amine, 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane, 4,7,13,18-tetraoxa-1,10-diazabicyclo[8.5.5]eicosane, 1,4,10,13-tetraoxa-7,16-diazabicyclooctadecane, and 1-aza-12-crown-4,1-aza-15-crown-5,1-aza-18-crown-6.

In the present invention, the basic compound is preferably incorporated in an amount of 0.001 to 2 parts by weight, particularly 0.01 to 1 part by weight relative to 100 parts by weight of the whole basic resin. Amounts less than 0.001 part by weight may not bring about any incorporating effects, while those exceeding 2 parts by weight may excessively lower the sensitivity.

For efficient synthesis of the base of the present invention, Michael addition (exemplified by the formula IV) or alkylation (exemplified by the formula V) of an amine, and acylation or etherification (exemplified by the formula VI) of an alkanolamine are used either singly or in combination. The synthesis process is however not limited thereto.

wherein, R and R′ may be the same or different and each independently represents a substituted or unsubstituted methyl group, R″ represents an alkylene group, R′″ represents a substituted or unsubstituted methyl group (in the case of etherification) or a substituted or unsubstituted acyl group (in the case of acylation), and Z represents a leaving group such as halogen.

EXAMPLES

The present invention will hereinafter be described more specifically by Synthesis Examples, Examples and Comparative Examples. It should however be borne in mind that the present invention is not limited to or by them.

The basic compound of the present invention was synthesized in the below-described manner.

Synthesis Example 1

Synthesis of tris(2-formyloxyethyl)amine:

A mixture of 6.00 g of triethanolamine and 200 g of formic acid was heated to 100° C. for 20 hours. After removal of the formic acid by distillation under reduced pressure, the residue was diluted with ethyl acetate, followed by neutralization with a saturated aqueous solution of sodium bicarbonate. After separation into layers, washing with water and drying over anhydrous sodium sulfate, concentration was conducted under reduced pressure. The residue was purified by distillation under reduced pressure, whereby 8.10 g of tris(2-formyloxyethyl)amine was obtained (boiling point: 127 to 131° C./60 Pa, yield: 86%).

IR (thin film): ν=2954, 2839, 1722, 1458, 1362, 1282, 1165, 1076, 1005 cm¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.86(6H,t,J=5.9 Hz), 4.19(6H,t,J=5.9 Hz), 8.03(3H,s).

Synthesis Example 2

Synthesis of tris(2-acetoxyethyl)amine:

In 150 g of THF was dissolved 14.9 g of triethanolamine. To the resulting solution was added 40.4 g of triethylamine. After cooling over an ice bath, 27.5 g of acetyl chloride was added dropwise at a temperature not exceeding 30° C. The reaction mixture was heated to 75° C. over an oil bath and heated for 2 hours to be refluxed. After completion of the maturation, the reaction mixture was allowed to cool down to room temperature. The reaction was terminated by the addition of 100 g of water. To the organic layer thus separated was added 200 g of dichloromethane. The organic layer was washed with 100 g of water. The organic layer was concentrated under reduced pressure, followed by distillation under reduced pressure, whereby 20.6 g of the title tris(2-acetoxyethyl)amine was obtained (boiling point: 145 to 148° C./70 Pa, yield: 75%).

¹H-NMR (300 MHz in CDCl₃): δ=2.02(9H,s), 2.80(6H,t), 4.08(6H,t).

Synthesis Example 3

Synthesis of tris(2-propionyloxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of propionyl chloride instead of acetyl chloride, tris(2-propionyloxyethyl)amine was synthesized (boiling point: 154 to 155° C./30 Pa, yield: 82%).

¹H-NMR (300 MHz in CDCl₃): δ=1.09(9H,t), 2.29(6H,q), 2.80(6H,t), 4.08(6H,t).

Synthesis Example 4

Synthesis of tris(2-butyryloxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of butyryl chloride instead of acetyl chloride, tris(2-butyryloxyethyl)amine was synthesized (boiling point: 183 to 185° C./30 Pa, yield: 68%).

¹H-NMR (300 MHz in CDCl₃): δ=0.92(9H,t), 162(6H,m), 2.25(6H,t), 4.09(6H,t), 2.81(6H,t).

Synthesis Example 5

Synthesis of tris(2-isobutyryloxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of isobutyryl chloride instead of acetyl chloride, tris(2-isobutyryloxyethylamine was synthesized (boiling point: 179 to 180° C./30 Pa, yield: 87%).

¹H-NMR. (300 MHz in CDCl₃): δ=1.13(18H,d), 2.51(3H,m), 2.82(6H,t), 4.09(6H,t).

Synthesis Example 6

Synthesis of tris(2-valeryloxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of valeryl chloride instead of acetyl chloride, tris(2-valeryloxyethyl)amine was synthesized (boiling point: 190 to 193° C./30 Pa, yield: 75%).

¹H-NMR (300 MHz in CDCl₃): δ=0.89(9H,t), 1.32(6H,m), 1.58(6H,m), 2.28(6H,t), 4.10(6H,t).

Synthesis Example 7

Synthesis of tris(2-pivaloyloxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of pivaloyl chloride instead of acetyl chloride, tris(2-pivaloyloxyethyl)amine was synthesized (boiling point: 183 to 185° C./30 Pa, yield: 60%).

¹H-NMR (300 MHz in CDCl₃): δ=1.17(27H,s), 2.83(6H,t), 4.09(6H,t).

Synthesis Example 8

Synthesis of N,N-bis(2-acetoxyethyl)-2-(acetoxyacetoxy)ethylamine:

In 150 g of THF was dissolved 14.9 g of triethanolamine. To the resulting solution was added 40.4 g of triethylamine. The resulting mixture was cooled over ice bath and 15.7 g of acetyl chloride was added dropwise at a temperature not exceeding 30° C. The reaction mixture was heated over an oil bath to 75° C. and heating was conducted for 2 hours under reflux. Then, 20.5 g of acetoxyacetyl chloride was added and the resulting mixture was heated under reflux for further 2 hours. After the reaction mixture was allowed to be cooled down, 100 g of water was added to terminate the reaction. The organic layer thus separated was added with 200 g of dichloromethane, and then washed with 100 g of water. The organic layer was concentrated under reduced pressure, followed by distillation under reduced pressure, whereby 18.3 g of N,N-bis(2-acetoxyethyl)-2-(acetoxyacetoxy)ethylamine was obtained as the title compound (boiling point: 153 to 155° C./24 Pa, yield: 55%).

IR (thin film): ν=2958, 2837, 1740, 1425, 1373, 1238, 1198, 1082, 1043 cm¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.03 (6H,s), 2.13(3H,s), 2.75-2.85(6H,m), 4.08(4H,t,J=6.2 Hz), 4.19(2H,t,J=6.0 Hz), 4.58(2H,s).

Synthesis Example 9

Synthesis of tris(2-methoxyqarbonyloxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of methyl chloroformate instead of acetyl chloride, tris(2-methoxycarbonyloxyethyl)amine was synthesized.

Synthesis Example 10

Synthesis of tris(2-tert-butoxycarbonyloxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of di-tert-butyl pyrocarboxylate instead of acetyl chloride, tris(2-tert-butoxycarbonyloxyethyl)amine was synthesized.

Synthesis Example 11

Synthesis of tris[2(2-oxopropoxy)ethyl]amine:

In a similar manner to Synthesis Example 2 except for the use of chloroacetone instead of acetyl chloride, tris[2-(2-oxopropoxy)ethyl]amine was synthesized.

Synthesis Example 12

Synthesis of tris[2-(methoxycarbonylmethyl)oxyethyl]amine:

In a similar manner to Synthesis Example 2 except that methyl chloroacetate was used instead of acetyl chloride and 1.0 g of sodium iodide was added further, tris[2-(methoxycarbonylmethyl)oxyethyl]amine was synthesized.

Synthesis Example 13

Synthesis of tris[2-(tert-butoxycarbonylmethyloxy)ethyl]amine:

In a similar manner to Synthesis Example 12 except for the use of tert-butyl chloroacetate instead of methyl chloroacetate, tris[2-(tert-butoxycarbonylmethyl)oxyethyl]amine was synthesized.

Synthesis Example 14

Synthesis of tris[2-(cyclohexyloxycarbonylmethyloxy)ethyl]amine:

In a similar manner to Synthesis Example 12 except for the use of cyclohexyl chloroacetate instead of methyl chloroacetate, tris[2-(cyclohexyloxycarbonylmethyloxy)ethyl]amine was synthesized.

Synthesis Example 15

Synthesis of tris(2-methoxycarbonylethyl)amine:

While vigorously stirring at 0° C., 5.00 g of 28% aqueous ammonia was added to 21.2 g of methyl acrylate. The resulting mixture was heated gradually to 25° C. over 20 hours. After concentration under reduced pressure, the residue was purified by distillation under reduced pressure, whereby tris(2-methoxycarbonylethyl)amine was obtained (boiling point: 143° C./70 Pa, yield: 76%),

IR (thin film): ν=2954, 2839, 1738, 1437, 1255, 1200, 1172 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.41 (6H,t,J=7.7 Hz), 2.73 (6H,t,J=7.7 Hz), 3.63(9H,s).

Synthesis Example 16

Synthesis of tris(2-ethoxycarbonylethyl)amine:

In a similar manner to Synthesis Example 15 except for the use of ethyl acrylate instead of methyl acrylate, tris(2-ethoxycarbonylethyl)amine was synthesized.

Synthesis Example 17

Synthesis of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine:

At 20 to 30° C., 9.01 g of methyl acrylate was added to 10.0 g of diethanolamine. The resulting mixture was allowed to stand for 20 hours. The reaction mixture was concentrated under reduced pressure, whereby N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine was obtained (yield: 98%).

IR (thin film): ν=3385 (br.), 2953, 2881, 2833, 1734, 1439, 1404, 1363, 1259, 1198, 1035 cm⁻¹. ¹H-NMR (270 MHz in CDCl₃): δ=2.48 (2H,t,J=6.3 Hz), 2.62(4H,t,J=5.1 Hz), 2.83(2H,t,J=6.3 Hz), 3.01(1H,br.s), 3.58(4H,t,J=5.1 Hz, 3.67(3H,s).

Synthesis Example 18

Synthesis of N,N-bis(2-acetoxyethyl)-2-(methoxycarbonyl)ethylamine:

At 20 to 30° C., acetic anhydride was added to a mixture of 9.29 g of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, 12.8 g of triethylamine, 50 mg of 4-dimethylaminopyridine and 50 ml of THF and the resulting mixture was stirred for 20 hours. Water was added to terminate the reaction. The reaction mixture was extracted with ethyl acetate. The organic layer was then washed with water and dried over anhydrous sodium sulfate. After concentration under reduced pressure, the residue was purified by distillation under reduced pressure, whereby 13.2 g of N,N-bis(2-acetoxyethyl)-2-(methoxycarbonyl)ethylamine was obtained (boiling point: 118 to 123° C./21 Pa, yield: 99%).

IR (thin film): ν=2954, 2837, 1740, 1437, 1373, 1238, 1203, 1039 cm⁻¹. ¹H-NMR (270 MHz in CDCl₃): δ=2.02(6H,s), 2.42(2H,t,J=7.1 Hz), 2.74(4H,t,J=5.9 Hz), 2.87(2H,t,J=7.1 Hz), 3.64(3H,s), 4.07(4H,t,J=5.9 Hz).

Synthesis Example 19

Synthesis of N,N-bis(2-hydroxyethyl)-2-(ethoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 17 except for the use of ethyl acrylate instead of methyl acrylate, N,N-bis(2-hydroxyethyl)-2-(ethoxycarbonyl)ethylamine was synthesized (yield: 94%).

IR (thin film): ν=3400 (br.), 2951, 2875, 2829, 1732, 1462, 1400, 1371, 1255, 1190, 1039 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=1.24 (3H,t,J=7.2 Hz), 2.46 (2H,t,J=7.1 Hz), 2.60(4H,m), 2.82(2H,t,J=7.1 Hz), 3.17(2H,br.s), 3.57(4H,m), 4.12(2H,q,J=7.2 Hz).

Synthesis Example 20

Synthesis of N,N-bis(2-acetoxyethyl)-2-(ethoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 1.8 except for the use of N,N-bis(2-hydroxyethyl)-2-(ethoxycarbonyl)ethylamine instead of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(ethoxycarbonyl)ethylamine was synthesized.

Synthesis Example 21

Synthesis of N,N-bis(2-hydroxyethyl)-2-(2-methoxyethoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 17 except for the use of 2-methoxyethyl acrylate instead of methyl acrylate, N,N-bis(2-hydroxyethyl)-2-(2-methoxyethoxycarbonyl)ethylamine was synthesized (yield: 97%).

Synthesis Example 22

Synthesis of N,N-bis(2-acetoxyethyl)-2-(2-methoxyethoxycarbonyl)ethylamine

In a similar manner to Synthesis Example 18 except for the use of N,N-bis(2-hydroxyethyl)-2-(2-methoxyethoxycarbonyl)ethylamine instead of N,N-bis (2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(2-methoxyethoxycarbonyl)ethylamine was synthesized (boiling point: 146 to 148° C./9.3 Pa, yield: 86%).

IR (thin film): ν=2954, 2893, 2825, 1738, 1456, 1371, 1238, 1198, 1130, 1039 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.02(6H,s), 2.46(2H,t,J=7.1 Hz), 2.74(4H,t,J=6.0 Hz), 2.88(0.2H,t,J=7.1 Hz), 3.36(3H,s), 3.56(2H,m), 4.08(4H,t,J=6.0 Hz), 4.20(2H,m).

Synthesis Example 23

Synthesis of N,N-bis(2-hydroxyethyl)-2-(2-hydroxyethoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 17 except for the use of 2-hydroxyethyl acrylate instead of methyl acrylate, N,N-bis(2-hydroxyethyl)-2-(2-hydroxyethoxycarbonyl)ethylamine was synthesized (yield: 99%).

Synthesis Example 24

Synthesis of N,N-bis(2-acetoxyethyl)-2-(2-acetoxyethoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 18 except for the use of N,N-bis(2-hydroxyethyl)-2-(2-hydroxyethoxycarbonyl)ethylamine instead of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(2-acetoxyethoxycarbonyl)ethylamine was synthesized (boiling point: 164 to 166° C./27 Pa, yield: 96%).

IR (thin film): ν=2960, 2837, 1740, 1443, 1375, 1236, 1190, 1043 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.02(6H,s), 2.05(3H,s), 2.45(2H,t,J=6.9 Hz), 2.75(4H,t,J=6.1 Hz), 2.88(2H,t,J=6.9 Hz), 4.08(4H,t,J=6.1 Hz), 4.25(4H,s).

Synthesis Example 25

Synthesis of N,N-bis(2-hydroxyethyl)-2-[(methoxycarbonyl)methoxycarobnyl]ethylamine:

In a similar manner to Synthesis Example 17 except for the use of methoxycarbonylmethyl acrylate instead of methyl acrylate, N,N-bis(2-hydroxyethyl)-2-[(methoxycarbonyl)-methoxycarbonyl]ethylamine was synthesized.

Synthesis Example 26

Synthesis of N,N-bis(2-acetoxyethyl)-2-[(methoxycarbonyl)methoxycarbonyl]ethylamine:

In a similar manner to Synthesis Example 18 except for the use of N,N-bis(2-hydroxyethyl)-2-[(methoxycarbonyl)methoxycarbonyl]ethylamine instead of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-[(methoxycarbonyl)methoxycarbonyl]ethylamine was synthesized (boiling point: 154 to 157° C./17 Pa, yield: 60%).

IR (thin film): ν=2956, 2837, 1740, 1439, 1377, 1236, 1180, 1041 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.02(6H,s), 2.54(2H,t,J=7.1 Hz), 2.76(4H,t,J=5.9 Hz), 2.92(2H,t,J=7.1 Hz), 3.74(3H,s), 4.09(4H,t,J=5.9 Hz), 4.59(2H,s).

Synthesis Example 27

Synthesis of N,N-bis(2-hydroxyethyl)-2-(2-oxopropoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 17 except for the use of 2-oxopropyl acrylate instead of methyl acrylate, N,N-bis(2-hydroxyethyl)-2-(2-oxopropoxycarbonyl)ethylamine was synthesized (yield: 98%).

Synthesis Example 28

Synthesis of N,N-bis(2-acetoxyethyl)-2-(2-oxopropoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 18 except for the use of N,N-bis(2-hydroxyethyl)-2-(2-oxopropoxycarbonyl)ethylamine instead of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(2-oxopropoxycarbonyl)ethylamine was synthesized (boiling point: 165° C./27 Pa, yield: 85%).

IR (thin film): ν=2960, 2837, 1736, 1421, 1373, 1238, 1174, 1041 cm¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.02(6H,s), 2.13(3H,s), 2.55(2H,t,J=7.1 Hz), 2.76(4H,t,J=5.9 Hz), 2.92(2H,t,J=7.1 Hz), 4.08(4H,t,J=5.9 Hz), 4.63(2H,s).

Synthesis Example 29

Synthesis of N,N-bis(2-hydroxyethyl)-2-(tetrahydrofurfuryloxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 17 except for the use of tetrahydrofurfuryl acrylate instead of methyl acrylate, N,N-bis(2-hydroxyethyl)-2-(tetrahydrofurfuryloxycarbonyl)ethylamine was synthesized (yield: 97%).

Synthesis Example 30

Synthesis of N,N-bis(2-acetoxyethyl)-2-(tetrahydrofurfuryloxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 18 except for the use of N,N-bis(2-hydroxyethyl)-2-(tetrahydrofurfuryloxycarbonyl)ethylamine instead of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, N,N-bis(2-acetoxyethyl)-2-(tetrahydrofurfuryloxycarbonyl)ethylamine was synthesized (boiling point: 165° C./20 Pa, yield: 76%).

IR (thin film): ν=2958, 2873, 1740, 1450, 1371, 1238, 1193, 1039 cm¹. ¹H-NMR (300 MHz in CDCl₃): δ=0.56 (1H,m), 1.80-2.10 {10H,m including 2.02(6H,s)}, 2.47(2H,t,J=7.1 Hz), 2.74(4H,t,J=6.0 Hz), 2.88(2H,t,J=7.1 Hz), 3.70-4.20 {9H,m including 4.06(4H,t,J=6.0H)}.

Synthesis Example 31

Synthesis of N,N-bis(2-hydroxyethyl)-2-[(2-oxotetrahydrofuran-3-yl)oxycarbonyl]ethylamine:

In a similar manner to Synthesis Example 17 except for the use of (2-oxotetrahydrofuran-3-yl) instead of methyl acrylate, N,N-bis(2-hydroxyethyl)-2-[(2-oxotetrahydrofuran-3-yl)oxycarbonyl]ethylamine was synthesized.

Synthesis Example 32

Synthesis of N,N-bis(2-acetoxyethyl)-2-[(2-oxotetrahydrofuran-3-yl)oxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 18 except that N,N-bis(2-hydroxyethyl)-2-[(2-oxotetrahydrofuran-3-yl)oxycarbonyl]ethylamine was used instead of N,N-bis(2-hydroxyethyl)-2-(methoxycarbonyl)ethylamine, and purification was conducted by silica gel chromatography, N,N-bis(2-acetoxyethyl)-2-[(2-oxotetrahydrofuran-3-yl)oxycarbonyl]ethylamine was synthesized (yield: 70%).

IR (thin film): ν=2962, 2837, 1792, 1743, 1668, 1456, 1437, 1373, 1240, 1196, 1095, 1043 cm⁻¹.

Synthesis Example 33

Synthesis of N,N-bis(2-hydroxyethyl)-2-(4-hydroxybutoxycarbonyl)ethylamine

In a similar manner to Synthesis Example 17 except for the use of 4-hydroxybutyl acrylate instead of methyl acrylate, N,N-his(2-hydroxyethyl)-2-(4-hydroxybutoxycarbonyl)ethylamine was synthesized.

Synthesis Example 34

Synthesis of N,N-bis(2-formyloxyethyl)-2-(4-formyloxybutoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 1 except for the use of N,N-bis(2-hydroxyethyl)-2-(4-hydroxybutoxycarbonyl)ethylamine instead of triethanolamine, N,N-bis(2-formyloxyethyl)-2-(4-formyloxybutoxycarbonyl)ethylamine was synthesized (yield: 70%).

IR (thin film): ν=2960, 2839, 1722, 1466, 1363, 1254, 1176, 1065 cm¹. ¹H-NMR (270 MHz in CDCl₃): δ=1.65-1.80(4H,m), 2.44(2H,t,J=7.2 Hz), 2.80(4H,t,J=5.8 Hz), 2.89(2H,t,J=7.2 Hz), 4.05-4.25(8H,m), 8.03(2H,s), 8.04(1H,s).

Synthesis Example 35

Synthesis of N,N-bis(2-formyloxyethyl)-2-(2-formyloxyethoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 1 except for the use of N,N-bis(2-hydroxyethyl)-2-(2-hydroxyethoxycarbonyl)ethylamine instead of triethanolamine, N,N-bis(2-formyloxyethyl)-2-(2-formyloxyethoxycarbonyl)ethylamine was synthesized (yield: 40%).

IR (thin film): ν=2956, 2839, 1722, 1456, 1275, 1254, 1173, 1061 cm¹. ¹H-NMR (270 MHz in CDCl₃): δ=2.47 (2H,t,J=7.0 Hz), 2.80(4H,t,J=5.9 Hz), 2.90(2H,t,J=7.0 Hz), 4.19(4H,t,J=5.9 Hz), 4.25-4.40(4H,m), 8.03(2H,s), 8.06(1H,s).

Synthesis Example 36

Synthesis of N,N-bis(2-methoxyethyl)-2-(methoxycarbonyl)ethylamine:

In a similar manner to Synthesis Example 17 except that bis(2-methoxyethyl)amine was used instead of diethanolamine, and purification was conducted by distillation under reduced pressure, N,N-bis(2-methoxyethyl)-2-(methoxycarbonyl)ethylamine was synthesized (boiling point: 71 to 75° C./27 Pa, yield: 93%).

IR (thin film): ν=2951, 2927, 2877, 2818, 1740, 1437, 1254, 1198, 1119 cm⁻¹. ¹H-NMR (270 MHz in CDCl₃): δ=2.46(2H,t,J=7.3 Hz), 2.69(4H,t,J=6.0 Hz), 2.89(2H,t,J=7.3 Hz), 3.31(6H,s), 3.43(4H,t,J=6.0 Hz), 3.64(3H,s).

Synthesis Example 37

Synthesis of N-(2-hydroxyethyl)bis[2-(methoxycarbonyl)ethyl]amine:

At 20 to 30° C., 15.5 g of methyl acrylate was added to 5.00 g of 2-aminoethanol. The resulting mixture was allowed to stand for 20 hours, followed by concentration under reduced pressure, whereby 19.2 g of N-(2-hydroxyethyl)bis[2-(methoxycarbonyl)ethyl]amine was obtained (at a quantitative yield)

IR (thin film): ν=3467(br.), 2954, 2839, 1738, 1439, 1361, 1257, 1201, 1176, 1038 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.43(4H,t,J=6.8 Hz), 2.55(2H,m), 2.75(4H,t,J=6.8 Hz), 2.93(1H,br.s), 3.54(2H,m), 3.64(6H,s).

Synthesis Example 38

Synthesis of N-(2-acetoxyethyl)bis[2-(methoxycarbonyl)ethyl]amine:

At 20 to 30° C., 2.56 g of acetic anhydride was added to a mixture of 5.00 g of N-(2-hydroxyethyl)bis[2-(methoxycarbonyl)ethyl]amine, 2.97 g of triethylamine, 50 mg of 4-dimethylaminopyridine and 25 g of THF. The resulting mixture was stirred for 5 hours. Water was added to terminate the reaction. The reaction mixture was then extracted with ethyl acetate. The organic layer was washed with water and dried over anhydrous sodium sulfate. After concentration under reduced pressure, the residue was purified by distillation under reduced pressure, whereby 5.30 g of N-(2-acetoxyethyl)bis[2-(methoxycarbonyl)ethyl]amine was obtained (boiling point: 120° C./15 Pa, yield: 92%).

IR (thin film): ν=2954, 2839, 1740, 1439, 1373, 1238, 1200, 1176, 1039 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=2.01 (3H,s), 2.41 (4H,t,J=6.9 Hz), 2.67(2H,t,J=6.0 Hz), 2.79(4H,t,J=6.9 Hz), 3.63(6H,s), 4.06(2H,t,J=6.0 Hz).

Synthesis Example 39

Synthesis of N-(2-hydroxyethyl)bis[2-(ethoxycarbonyl)ethyl]amine:

In a similar manner to Synthesis Example 37 except for the use of ethyl acrylate instead of methyl acrylate, N-(2-hydroxyethyl)bis[2-(ethoxycarbonyl)ethyl]amine was synthesized (yield: 82%).

IR (thin film): ν=3502(br.), 2981, 2829, 1734, 1463, 1371, 1346, 1255, 1184, 1039 cm¹. ¹H-NMR (300 MHz in CDCl₃): δ=1.23 (6H,t,J=7.1 Hz), 2.42(4H,t,J=6.7 Hz), 2.57(2H,m), 2.77(4H,t,J=6.7 Hz), 2.96(1H,m), 3.55(2H,m), 4.10(4H,q,J=7.1 Hz).

Synthesis Example 40

Synthesis of N-(2-acetoxyethyl)bis[2-(ethoxycarbonyl)ethyl]amine:

In a similar manner to Synthesis Example 38 except for the use of N-(2-hydroxyethyl)bis[2-(ethoxycarbonyl)ethyl]amine instead of N-(2-hydroxyethyl)bis[2-(methoxycarbonyl)ethyl]amine, N-(2-acetoxyethyl)bis[2-(ethoxycarbonyl)ethyl]amine was synthesized.

Synthesis Example 41

Synthesis of N-(3-hydroxy-1-propyl)bis[2-(methoxycarbonyl)ethyl]amine:

In a similar manner to Synthesis Example 37 except for the use of 3-amino-1-propanol instead of 2-aminoethanol, N-(3-hydroxy-1-propyl)bis[2-(methoxycarbonyl)ethyl]amine was synthesized (at a quantitative yield).

IR (thin film): ν=3435(br.), 2953, 2841, 1738, 1439, 1358, 1331, 1255, 1200, 1174, 1134, 1051 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=1.66 (2H,m), 2.47(4H,t,J=7.0 Hz), 2.60(2H,m), 2.76(4H,t,J=7.0 Hz), 3.65(9H,s), 3.68(2H,m), 3.83(1H,br.s).

Synthesis Example 42

Synthesis of N-(3-acetoxy-1-propyl)bis[2-(methoxycarbonyl)ethyl]amine:

In a similar manner to Synthesis Example 38 except for the use of N-(3-hydroxy-1-propyl)bis[2-(methoxycarbonyl)ethyl]amine instead of N-(2-hydroxyethyl)bis[2-(methoxycarbonyl)ethyl]amine, N-(3-acetoxy-1-propyl)bis[2-(methoxycarbonyl)ethyl]amine was synthesized.

Synthesis Example 43

Synthesis of N-(2-methoxyethyl)bis(2-(methoxycarbonyl)ethyl]amine:

In a similar manner to Synthesis Example 37 except for the use of 2-methoxyethylamine instead of 2-aminoethanol, N-(2-methoxyethyl)bis[2-(methoxycarbonyl)ethyl]amine was synthesized (boiling point: 81 to 85° C./27 Pa, yield: 96%).

IR (thin film): ν=2953, 2839, 1740, 1437, 1255, 1200, 1176, 1119 cm⁻¹. ¹H-NMR (270 MHz in CDCl₃): δ=2.44 (4H,t,J=7.2 Hz), 2.63 (2H,t,J=6.1 Hz), 2.81(4H,t,J=7.2 Hz), 3.31 (3H,s), 3.41(2H,t,J=6.1 Hz), 3.64 (6H,s).

Synthesis Example 44

Synthesis of N-butylbis[2-(methoxycarbonyl)ethyl]amine:

At 20 to 30° C., 12.9 g of methyl acrylate was added to 5.00 g of n-butylamine. The resulting mixture was allowed to stand for 20 hours, followed by concentration under reduced pressure, whereby 16.7 g of N-butylbis[2-(methoxycarbonyl)ethyl]amine was obtained (at a quantitative yield).

IR (thin film): ν=2954, 1740, 1437, 1254, 1198, 1174 cm⁻¹. ¹H-NMR (300 MHz in CDCl₃): δ=0.87(3H,t,J=7.2 Hz), 1.15-1.45(4H,m), 2.37(2H,t,J=7.4 Hz), 2.41(4H,t,J=7.1 Hz), 2.73(4H,t,J=7.1 Hz), 3.64(6H,s).

Synthesis Example 45

Synthesis of N-butylbis[2-(2-methoxyethoxycarbonyl)ethyl]amine:

In a similar manner to Synthesis Example 44 except for the use of 2-methoxyethyl acrylate instead of methyl acrylate, N-butylbis[2-(2-methoxyethoxycarbonyl)ethyl]amine was synthesized (boiling point: 156° C./28 Pa, yield: 90%).

IR (thin film): ν=2956, 2931, 2875, 2819, 1736, 1456, 1375, 1252, 1182, 1130, 1036 cm¹. ¹H-NMR (300 MHz in CDCl₃): δ=0.86(3H,t,J=7.2 Hz), 1.15-1.45(4H,m), 2.37(2H,t,J=7.1 Hz), 2.46(4H,t,J=7.4 Hz), 2.74(4H,t,J=7.4H), 3.35(6H,s), 3.56(4H,m), 4.19(4H,m).

Synthesis Example 46

Synthesis of N-methylbis(2-acetoxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of N-methyldiethanolamine instead of triethanolamine, N-methylbis(2-acetoxyethyl)amine was synthesized.

Synthesis Example 47

Synthesis of N-ethylbis(2-acetoxyethyl)amine:

In a similar manner to Synthesis Example 2 except for the use of N-ethyldiethanolamine instead of triethanolamine, N-ethylbis(2-acetoxyethyl)amine was synthesized.

Synthesis Example 48

Synthesis of N-methylbis(2-pivaloyloxyethyl)amine:

In a similar manner to Synthesis Example 7 except for the use of N-methyldiethanolamine instead of triethanolamine, N-methylbis(2-pivaloyloxyethyl)amine was synthesized.

Synthesis Example 49

Synthesis of N-ethylbis[2-(methoxycarbonyloxy)ethyl]amine:

In a similar manner to Synthesis Example 9 except for the use of N-ethyldiethanolamine instead of triethanolamine, N-ethylbis[2-(methoxycarbonyloxy)ethyl]amine was synthesized.

Synthesis Example 50

Synthesis of N-ethylbis[2-(tert-butoxycarbonyloxy)ethyl]amine:

In a similar manner to synthesis Example 10 except for the use of N-methyldiethanolamine instead of triethanolamine, N-ethylbis[2-(tert-butoxycarbonyloxy)ethyl]amine was synthesized.

Synthesis Example 51

Synthesis of tris(methoxycarbonylmethyl)amine:

At 0 to 10° C., 29.4 g of methyl chloroacetate, and then 70 g of a saturated aqueous solution of potassium carbonate were added to a mixture of 5.00 g of 28% aqueous ammonia and 50 g of THF. The resulting mixture was stirred at room temperature for 20 hours. The reaction mixture was then extracted with diethyl ether, followed by washing with water, drying over anhydrous sodium sulfate and concentration under reduced pressure, whereby tris(methoxycarbonylmethyl)amine was obtained.

Synthesis Example 52

Synthesis of tris(ethoxycarbonylmethyl)amine:

In a similar manner to Synthesis Example 51 except for the use of ethyl chloroacetate instead of methyl chloroacetate, tris(ethoxycarbonylmethyl)amine was synthesized.

Synthesis Example 53

Synthesis of N-butylbis(methoxycarbonylmethyl)amine:

In a similar manner to Synthesis Example 51 except for the use of n-butylamine instead of aqueous ammonia, N-butylbis(methoxycarbonylmethyl)amine was synthesized.

Synthesis Example 54

Synthesis of N-hexylbis(methoxycarbonylmethyl)amine:

In a similar manner to Synthesis Example 51 except for the use of n-hexylamine instead of aqueous ammonia, N-hexylbis(methoxycarbonylmethyl)amine was synthesized.

Synthesis Example 55

Synthesis of β-(diethylamino)-δ-valerolactone:

At 20 to 30° C., 4.00 g of diethylamine was added to 5.10 g of 5,6-dihydro-2H-pyran-2-one. The resulting mixture was allowed to stand for 20 hours, followed by concentration under reduced pressure, whereby β-(diethylamino)-δ-valerolactone was obtained.

Example 1

A resist solution was prepared by adding, at ratios as shown in the column of Example 1 of Table 1, the polymer, acid generator, base, dissolution inhibitor and crosslinker to 600 parts by weight of a 70:30 (weight ratio) mixed solvent of propylene glycol monomethyl ether acetate (PGMEA) and ethyl lactate (EL) to dissolve the former in the latter, followed by filtration through a 0.1-μm Teflon® filter.

Examples 2 to 63, Comparative Examples 1 to 12

In Examples 2 to 63, and Comparative Examples 1 to 12, resist solutions were prepared as in Example 1 under the conditions as shown in Tables 1 to 5. The structure of each of Amines 1 to 55 and the structure, weight-average molecular weight (Mw) and its ratio to the number-average molecular weight (Mn) of each of Polymers 1 to 8 will be shown later.

Evaluation of a Resist

In each of Examples 2 to 63 and Comparative Examples 1 to 12, a resist solution was prepared by adding the polymer, acid generator, base, dissolution inhibitor and crosslinker to a 70:30 (weight ratio) solvent mixture of propylene glycol monomethyl ether acetate (PGMEA) and ethyl lactate (EL) to dissolve the former in the latter, followed by filtration through a 0.1-μm Teflon® filter.

The resist solution thus obtained was applied by spin coating onto a silicon wafer which has thereover a film of DUV-30 (trade name; product of Nissan Chemical) in the thickness of 55 nm and has a reflectance suppressed to 1% or less by a KrF light (248 nm). The resulting silicon wafer was baked on a hot plate at 100° C. for 90 seconds, whereby the thickness of the resist was adjusted to 550 nm.

The resulting resist was exposed to light of an excimer laser stepper (“NSR-S202A”, product of Nikon K.K., NA-0.5, σ: 0.75, 2/3 zonal light) at varied exposures and focuses. Immediately after exposure, the resist was baked at 110° C. for 90 seconds and then developed for 60 seconds in a 2.38 wt % aqueous solution of tetramethylammonium hydroxide, whereby a pattern was formed.

The resist pattern thus formed was evaluated in the following manner.

Provided that the exposure quantity with which a 0.16-μm line-and-space pattern is resolved at 1:1 is the optimum exposure (Eop) which serves as an index of resist sensitivity, the “focus margin” at this time is determined. The definition for the focus margin is such that it is free from a decrease in the pattern film and its size falls within 0.16 μm±10%.

Results are shown in Tables 1 to 5.

TABLE 1 Acid Polymer generator Base Dissolution inhibitor Focus (part by (part by (part by or crosslinker Sensitivity margin Example weight) weight) weight) (part by weight) (mJ/cm²) (μm) 1 1 PAG2 Amine 1 — 30 0.8 (100) (2) (0.1) 2 1 PAG2 Amine 2 — 35 0.9 (100) (2) (0.1) 3 1 PAG2 Amine 3 — 31 1.0 (100) (2) (01) 4 1 PAG2 Amine 4 — 30 1.0 (100) (2) (0.12) 5 1 PAG2 Amine 5 — 33 1.0 (100) (2) (0.12) 6 1 PAG2 Amine 6 — 28 1.0 (100) (2) (0.12) 7 1 PAG2 Amine 7 — 32 1.0 (100) (2) (0.1) 8 1 PAG2 Amine 8 — 39 1.0 (100) (2) (0.12) 9 1 PAG2 Amine 9 — 38 1.0 (100) (2) (0.16) 10 1 PAG2 Amine 10 — 36 1.0 (100) (2) (0.16) 11 2 PAG2 Amine 1 — 35 0.6 (100) (2) (0.1) 12 3 PAG2 Amine 1 — 31 1.1 (100) (2) (0.1) 13 4 PAG2 Amine 1 Crosslinker (15) 38 0.8 (100) (2) (0.1) 14 5 PAG1 Amine 1 — 33 0.8 (100) (2) (0.1) 15 6 PAG1 Amine 1 — 46 1.0 (100) (2) (0.1) 16 7 PAG1 Amine 1 — 48 1.0 (100) (2) (0.1) 17 8 PAG1 Amine 1 — 42 1.0 (100) (2) (0.1) 18 2 PAG2 Amine 1 DRI 31 0.8 (100) (2) (0.1) (20)

TABLE 2 Acid Polymer generator Base Dissolution inhibitor Focus (part by (part by (part by or crosslinker Sensitivity margin Example weight) weight) weight) (part by weight) (mJ/cm²) (μm) 19 1 PAG2 Amine 11 — 42 1.2 (100) (2) (0.1) 20 1 PAG2 Amine 12 — 40 1.0 (100) (2) (0.11) 21 1 PAG2 Amine 13 — 39 1.0 (100) (2) (0.12) 22 1 PAG2 Amine 14 — 38 1.0 (100) (2) (0.12) 23 1 PAG2 Amine 15 — 37 1.0 (100) (2) (0.13) 24 1 PAG2 Amine 16 — 36 0.9 (100) (2) (0.13) 25 1 PAG2 Amine 17 — 36 1.1 (100) (2) (0.12) 26 1 PAG2 Amine 18 — 38 1.0 (100) (2) (0.11) 27 1 PAG2 Amine 19 — 38 0.9 (100) (2) (0.09) 28 1 PAG2 Amine 20 — 38 1.0 (100) (2) (0.1) 29 1 PAG2 Amine 21 — 40 0.9 (100) (2) (0.09) 30 1 PAG2 Amine 22 — 38 1.0 (100) (2) (0.12) 31 1 PAG2 Amine 23 — 40 0.9 (100) (2) (0.1) 32 1 PAG2 Amine 24 — 38 1.0 (100) (2) (0.12) 33 1 PAG2 Amine 25 — 37 0.9 (100) (2) (0.1) 34 1 PAG2 Amine 26 — 36 1.2 (100) (2) (0.12) 35 1 PAG2 Amine 27 — 34 1.0 (100) (2) (0.13) 36 1 PAG2 Amine 28 — 36 1.1 (100) (2) (0.12)

TABLE 3 Acid Polymer generator Base Dissolution inhibitor Focus (part by (part by (part by or crosslinker Sensitivity margin Example weight) weight) weight) (part by weight) (mJ/cm²) (μm) 37 1 PAG2 Amine 29 — 37 1.0 (100) (2) (0.12) 38 1 PAG2 Amine 30 — 40 1.0 (100) (2) (016) 39 1 PAG2 Amine 31 — 36 0.9 (100) (2) (0.11) 40 1 PAG2 Amine 32 — 40 1.0 (100) (2) (0.13) 41 1 PAG2 Amine 33 — 37 0.9 (100) (2) (0.11) 42 1 PAG2 Amine 34 — 39 1.0 (100) (2) (0.14) 43 1 PAG2 Amine 35 — 34 0.9 (100) (2) (0.1) 44 1 PAG2 Amine 36 — 35 1.1 (100) (2) (0.12) 45 1 PAG2 Amine 37 — 40 1.2 (100) (2) (0.1) 46 1 PAG2 Amine 38 — 41 1.0 (100) (2) (0.1) 47 1 PAG2 Amine 39 — 38 1.0 (100) (2) (0.1) 48 1 PAG2 Amine 40 — 38 1.0 (100) (2) (0.1) 49 1 PAG2 Amine 41 — 41 1.0 (100) (2) (0.11) 50 1 PAG2 Amine 42 — 40 1.0 (100) (2) (0.1) 51 1 PAG2 Amine 43 — 38 1.0 (100) (2) (0.1) 52 1 PAG2 Amine 44 — 37 1.0 (100) (2) (0.1) 53 1 PAG2 Amine 45 — 37 0.9 (100) (2) (0.1) 54 1 PAG2 Amine 46 — 38 0.9 (100) (2) (0.12)

TABLE 4 Acid Polymer generator Base Dissolution inhibitor Focus (part by (part by (part by or crosslinker Sensitivity margin Example weight) weight) weight) (part by weight) (mJ/cm²) (μm) 55 1 PAG2 Amine 47 — 34 0.9 (100) (2) (0.09) 56 1 PAG2 Amine 48 — 35 0.8 (100) (2) (0.11) 57 1 PAG2 Amine 49 — 34 0.9 (100) (2) (0.11) 58 1 PAG2 Amine 50 — 36 0.8 (100) (2) (0.12) 59 1 PAG2 Amine 51 — 34 0.8 (100) (2) (0.12) 60 1 PAG2 Amine 52 — 40 1.0 (100) (2) (0.1) 61 1 PAG2 Amine 53 — 39 1.0 (100) (2) (0.11) 62 1 PAG2 Amine 54 — 40 0.9 (100) (2) (0.1) 63 1 PAG2 Amine 55 — 40 0.9 (100) (2) (0.11)

TABLE 5 Acid Polymer generator Base Dissolution inhibitor Focus Comparative (part by (part by (part by or crosslinker Sensitivity margin Example weight) weight) weight) (part by weight) (mJ/cm²) (μm) 1 1 PAG2 — — 5 0 (100) (2) 2 1 PAG2 Proton — 30 0.4 (100) (2) sponge (0.2) 3 1 PAG2 DBN — 25 0.4 (100) (2) (0.1) 4 1 PAG2 DBU — 28 0.5 (100) (2) (0.1) 5 2 PAG2 DBN — 35 0.2 (100) (2) (0.1) 6 3 PAG2 DBN — 31 0.5 (100) (2) (0.1) 7 4 PAG2 DBN Crosslinker 38 0.3 (100) (2) (0.1) (15) 8 5 PAG1 DBN — 33 0.3 (100) (2) (0.1) 9 6 PAG1 DBN — 46 0.6 (100) (2) (0.1) 10 7 PAG1 DBN — 48 0.6 (100) (2) (0.1) 11 8 PAG1 DBN — 42 0.6 (100) (2) (0.1) 12 2 PAG2 DBN DRI 31 0.4 (100) (2) (0.1) (20) 

1. A resist composition comprising one or more basic compounds selected from those represented by the following formula (I):

wherein, n stands for 1, 2 or 3; side chains Xs are the same or different and each independently represents —R¹—O—R² or —R¹—C(═O)—O—R⁶¹, in which R¹s are the same or different and each independently represents an alkylene group of 1 to 5 carbon atoms, R²s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms containing a carbonyl or ester group, and R⁶¹s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a carbonyl group, an ester group, an ether group, a hydroxyl group or a lactone ring, or R¹ and R², or R¹ and R⁶¹ in the same side chain may be coupled together to form a ring; and side chains Ys are the same or different and each independently represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain an ether or hydroxyl group.
 2. A resist composition according to claim 1, wherein n in the formula (I) stands for 1 or
 2. 3. A resist composition according to claim 2, further comprising an organic solvent, a base resin which is an alkali insoluble or sparingly-soluble resin having an acidic functional group protected with an acid-labile group but becomes alkali soluble upon elimination of said acid-labile group, and an acid generator; and being a positive type.
 4. A resist composition according to claim 3, further comprising a dissolution inhibitor.
 5. A resist composition according to claim 2, further comprising an organic solvent, a base resin which is an alkali soluble resin but becomes sparingly soluble in alkali by crosslinking with a crosslinker, an acid generator and said crosslinker which crosslinks in the presence of an acid; and being a negative type.
 6. A resist composition comprising one or more basic compounds selected from those represented by the following formulas (1) to (4),

wherein, R¹s are the same or different and each independently represents a C₁₋₅ alkylene group, R²s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms containing a carbonyl group or an ester group, R³ represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a hydroxyl or ether group, and R⁴s are the same or different and each independently represents a linear, branched or cyclic alkyl group of 1 to 20 carbon atoms which may contain a carbonyl, ester or ether group.
 7. A resist composition comprising one or more basic compounds selected from those represented by the following formula (II):

wherein, R⁶² represents a linear or branched alkylene group of 1 to 5 carbon atoms, p stands for 0, 1 or 2 with the proviso that p+q=3, R⁶³s are the same or different and each independently represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 15 carbon atoms which may contain an ether, carbonyl, ester or hydroxyl group and R⁶⁴s are the same or different and each independently represents a linear, branched or cyclic alkyl group which may contain a carbonyl group, an ester group, an ether group, a hydroxyl group or a lactone ring.
 8. A resist composition according to claim 7, further comprising an organic solvent, a base resin which is an alkali insoluble or sparingly-soluble resin having an acidic functional group protected with an acid-labile group but becomes alkali soluble upon elimination of said acid-labile group, and an acid generator; and being a positive type.
 9. A resist composition according to claim 8, further comprising a dissolution inhibitor.
 10. A resist composition according to claim 7, further comprising an organic solvent, a base resin which is an alkali soluble resin but becomes sparingly soluble in alkali by crosslinking with a crosslinker, an acid generator and said crosslinker which crosslinks in the presence of an acid; and being a negative type.
 11. A resist composition comprising one or more basic compounds selected from those represented by the following formula (III):

wherein R⁶⁵s are the same or different and each independently represents a hydrogen atom or a linear, branched or cyclic alkyl group of 1 to 15 carbon atoms which may contain an ether, carbonyl, ester or hydroxyl group. 